Cable line distributed fault accurate positioning method and device
A technology of precise positioning and cable routing, which is applied in the field of high-voltage cable industry, can solve problems such as difficult to quickly determine the fault point and fault location, the fault point cannot be accurately determined, troublesome power maintenance work, etc., to achieve fast and efficient troubleshooting and shorten maintenance power supply Time, the effect of reducing economic loss
Pending Publication Date: 2020-11-27
吉林省龙波电气技术有限公司
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Problems solved by technology
[0003] At present, the number of overhead lines and cable hybrid lines in the power industry is gradually increasing. When a fault occurs during daily operation and maintenance, it is difficult to quickly determine the fault point and location, which brings huge troubles to daily operation and maintenance work.
In the past, offline detection devices and manual inspection methods were used for fault finding, which was very inefficient and the fault point could not be accurately determined
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[0029] The present invention is specifically described below in conjunction with accompanying drawing, as Figure 1-3 As shown, a method and device for accurately locating distributed faults in cable lines. The system uses the D-type ranging principle to measure fault points. The specific method is to install high-speed high-frequency sensors 1 and GPS and Beidou timing devices on the line. When an occurrence occurs, use these devices to quickly read and record the time when the initial traveling wave surge of the fault arrives at the acquisition device for distance measurement calculation.
[0030] Depend on Figure 4 It can be seen that, assuming that the same propagation speed v is transmitted to the M-terminal and N-terminal buses, the time required is T M another T N , then the following relationship exists.
[0031]
[0032] In the formula: the lengths from the M-end and N-end buses to the fault point are respectively expressed as D MF and D NF to represent; L is...
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The invention discloses a cable line distributed fault accurate positioning method and device. The method comprises the following steps: S1, installing a high-frequency sensor at a direct grounding point of a cable shielding layer or at a position where a cable head pushes aside a cable core of the shielding layer; S2, deploying a system platform at a cloud server or a local master station; and S3, installing a plurality of triaxial accelerators and a plurality of thermocouples on the cable shielding layer. The traveling wave distance measurement technology is adopted; the fault position of the cable line can be quickly and accurately positioned; whether the fault point is an overhead line fault or a cable fault is determined; positioning is carried out according to accurate fault points;corresponding technical support is provided for related operation and maintenance personnel in the aspect of troubleshooting, troubleshooting is carried out rapidly and efficiently, the maintenance power supply time of the power industry is shortened, social and economic benefit losses caused by power failure are reduced, economic losses are greatly reduced, and it is ensured that operation and maintenance units meet the national related policy specification requirements in corresponding work assessment.
Description
technical field [0001] The invention relates to the field of high-voltage cable industry, in particular to a method and device for accurately locating distributed faults of cable lines. Background technique [0002] With the continuous development of power grid construction, 110 / 220Kv power cable power supply lines are more and more applied to the construction of urban power grids. At present, after a ground fault occurs in the cable, the possible impact is relatively large due to the large power supply radius. Therefore, it is of great significance to study the fast online location method of 110 / 220Kv power cable fault and the real-time online monitoring of circulating current to improve the quality of power supply. [0003] At present, the number of overhead lines and cable hybrid lines in the power industry is gradually increasing. When a fault occurs during daily operation and maintenance, it is difficult to quickly determine the fault point and location, which brings h...
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IPC IPC(8): G01R31/08G01J5/12G01S19/42
CPCG01R31/085G01J5/12G01S19/42G01J2005/126
Inventor 王志强王振浩李翀马明贾克音王朝斌丁镇贾曜诚
Owner 吉林省龙波电气技术有限公司